JP5549533B2 - Valve device - Google Patents

Description

  The present invention relates to, for example, a valve device that opens and closes a flow path through which intake air taken into an internal combustion engine is passed.

  Conventionally, as shown in FIG. 6, the valve device 100 includes a valve body 102 that opens and closes a flow path 101 through which intake air passes, a shaft 103 that transmits rotational torque to the valve body 102 and rotates the valve body 102, A bearing body 104 that supports the valve body 102 and forms a part of the flow path 101 is used, for example, to generate a tumble flow in a combustion chamber of an internal combustion engine (not shown).

By the way, according to the valve device 100, the shaft 103 is press-fitted and held in the valve body 102, and there is a case in which a great deal of attention is paid to the deviation load after the press-fitting.
Here, the displacement load is, for example, a load applied to one or both of the valve body 102 and the shaft 103 which are fixed and relatively stationary by press-fitting in the same direction or in the opposite direction to the press-fitting load. This is a load necessary for sliding either one of the shaft 102 and the shaft 103 relative to the other to move them relatively.

  Further, the deviation load can be expressed as a mathematical expression, for example, by multiplying the press-fit load by a coefficient, and this coefficient is smaller than 1 and larger than 0. For this reason, the displacement load is numerically smaller than the press-fit load.

  If the displacement load is too large, the valve body 102 is not easily displaced in the axial direction with respect to the shaft 103. For example, when the valve body 102 and the bearing body 104 abut on each other due to linear expansion of the resin material. Furthermore, there is a possibility that the rotation resistance becomes large and the valve body 102 cannot be smoothly rotated. On the other hand, if the displacement load is too small, the valve body 102 slides with respect to the shaft 103 and easily shifts in the axial direction, and contact and separation in the axial direction between the valve body 102 and the bearing body 104 are repeated. Abnormal noise and wear may occur.

  For this reason, it is required to set the deviation load to an appropriate value so as not to cause an increase in the rotational resistance of the valve body 102 when the deviation load is excessive and the occurrence of abnormal noise and wear when the deviation load is excessive. Yes.

Here, for example, Patent Document 1 discloses a structure in which a shaft is press-fitted and fixed to the valve body at substantially the center of the valve body. That is, according to the press-fitting and fixing structure of Patent Document 1, three protrusions are arranged in the axial direction of the shaft at approximately the center of the valve body, and these three protrusions are arranged on the front side → back side → front side. And alternately open in a U-shape in the order of back side → front side → back side (see FIGS. 1 and 2 of Patent Document 1).
However, according to this structure, since the valve body is in pressure contact with each other at the three protrusions, the displacement load is large. For this reason, it is considered that the rotational resistance of the valve body is likely to increase due to excessive displacement load.

According to Patent Document 2, the valve body has a through-hole through which the shaft passes, and the press-fitting and fixing portion of the shaft is provided at the approximate center of the through-hole. And the rib rib is provided in the wall surface of the through-hole of the right-and-left both sides of a press-fit fixing location, and the top part of the rib rib is crushed by the press-fitting of the shaft (FIGS. 2 and 3 of Patent Document 2). See).
However, according to this structure, the ribs are in contact with the shaft on both the left and right sides of the press-fitting and fixing portion. For this reason, if the concentricity of the left and right sides of the press-fit fixing portion deteriorates due to bending caused by the linear expansion and contraction of the resin material in the valve body, the displacement load becomes even larger than the press-fit load multiplied by a coefficient. There is a fear.

JP 2002-317718 A JP 2009-127620 A

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a structure in which a displacement load can be set to an appropriate numerical value in a valve device that press-fits and fixes a shaft to a valve body. Is to provide.

[Means of Claim 1]
According to the first aspect of the present invention, the valve device includes a valve body that opens and closes a passage through which intake air sucked into the internal combustion engine is passed, and a valve body that is press-fitted into the valve body and transmits rotational torque to the valve body. The valve body has three planar pressure contact surfaces that are pressed against the shaft by press-fitting the shaft.

  The three pressure contact surfaces are arranged in the order of left, center, and right when the axial direction of the shaft is defined as the left-right direction. It is provided so that it can be included in one imaginary plane parallel to the center, and one central pressure contact surface is provided so as to face and parallel to one imaginary plane across the shaft. And the shaft is hold | maintained at the valve body by being press-contacted by three press-contact surfaces and being pinched | interposed.

  As a result, the shaft is brought into pressure contact with only the three pressure contact surfaces and held by the valve body, so that the displacement load can be reduced. In addition, since the entire area of the pressure contact surface is small, reduction of the shift load due to stress relaxation is reduced, and the shift load can be stabilized.

Further, according to the means of claim 1 , a bearing portion is provided integrally with the valve body on the left side of the left pressure contact surface and the right side of the right pressure contact surface, respectively, and rotates together with the valve body. It is provided in a cylindrical shape and surrounds the shaft from the outer diameter side.

  When the direction perpendicular to the three pressure contact surfaces is defined as the vertical direction, the right end of the portion of the left bearing portion that is on the opposite side of the left pressure contact surface in the vertical direction (hereinafter referred to as the left corresponding right end). ) Is positioned between the left end and the right end of the left pressure contact surface. In addition, the left end of the portion on the opposite side of the right pressure contact surface in the up-down direction of the right bearing portion (hereinafter referred to as the right corresponding left end) is between the left end and the right end of the right pressure contact surface. Positioned.

  In the case where the bearing portion is provided so as to surround the shaft from the outer diameter side, in order to facilitate the die cutting after the resin molding, for example, it is preferable that the die can be punched only in the vertical and horizontal directions. In this case, the right end of the left pressure contact surface cannot be positioned on the left side of the left side corresponding right end, and the left end of the right pressure contact surface cannot be positioned on the right side corresponding left end due to the restriction that the die can be removed only in the vertical and horizontal directions. Can not be positioned on the right side.

  Therefore, by positioning the left side corresponding right end between the left end and the right end of the left pressure contact surface and positioning the right side corresponding left end between the left end and the right end of the right pressure contact surface, Under the restriction, the left and right bearing portions and the three pressure contact surfaces can be provided simultaneously.

  Further, the correlation between the press-fit allowance to be applied to the press contact surface and the shift load is a linear correlation in which the shift load increases as the press-fit allowance increases. The increase rate of the shift load with respect to the press-fitting allowance is larger as the distance L1 in the left-right direction between the center pressure contact surface and the left pressure contact surface or the distance L2 in the left-right direction between the center pressure contact surface and the right pressure contact surface increases. Get smaller.

Therefore, for example, the right end of the left pressure contact surface is brought closer to the left side corresponding right end as far as possible, and the left end of the right pressure contact surface is brought closer to the right side corresponding left end as far as possible, and within the range satisfying the above limitation on die cutting Increase L1 and L2 to the maximum. As a result, the increase rate of the displacement load relative to the press-fit allowance can be reduced to the minimum, so that the numerical range of the press-fit allowance necessary to achieve the allowable range of the displace load can be shifted to the larger side, and the press-fit Dimensional tolerances can be widened.
For this reason, for example, the cost can be reduced by reducing the accuracy in forming the pressure contact surface.

[Means of claim 2 ]
According to the second aspect of the present invention, on the left side of the left pressure contact surface and on the right side of the right pressure contact surface, the escape spaces for preventing the shaft from contacting parts other than the three pressure contact surfaces are formed. . When the direction perpendicular to the three pressure contact surfaces is defined as the vertical direction, the dimension of the relief space in the vertical direction is the amount of deflection of the shaft and valve body in the vertical direction due to press-fitting and the vertical direction of the shaft and valve body. It is set based on the amount of linear expansion.

  Thereby, the dimension of the relief space in the vertical direction can be set in consideration of the variation factor in the vertical direction of the dimensions of the shaft and the valve body. For this reason, it is possible to avoid a situation in which the shaft and the valve body come into contact with each other except for the three pressure contact surfaces and the displacement load increases.

(A) is a top view which shows the assembly of the valve apparatus in an intake manifold, (b) is a fragmentary perspective view which shows the principal part of a valve apparatus (Example). (A) is a top view of a valve body, (b) is AA sectional drawing of (a), (c) is sectional drawing which shows the state by which the shaft was press-fit in the shaft holding part (implementation) Example). It is explanatory drawing which shows the die cutting direction after resin molding of a valve body (Example). It is a characteristic view which shows the correlation with a press-fit allowance and a shift | offset | difference load (Example). (A) is a partial cross-sectional view when the right end corresponding to the left side coincides with the left end of the left pressure contact surface (Example) , (b) is the right side corresponding to the left side located on the right side of the right end of the left pressure contact surface. If a partial sectional view of a (reference example), is a partial sectional view of a case where there (c) the right than the left end of the left corresponding right end contact face of the left side and the left side of the right end of the left contact face (Example). It is a fragmentary sectional view which shows the principal part of a valve apparatus (conventional example).

  A valve device according to an embodiment includes a valve body that opens and closes a flow path through which intake air sucked into an internal combustion engine is passed, and a shaft that is press-fitted into the valve body and transmits rotational torque to the valve body to rotate the valve body. The valve body has three planar pressure contact surfaces that are pressed against the shaft by press-fitting the shaft.

  The three pressure contact surfaces are arranged in the order of left, center, and right when the axial direction of the shaft is defined as the left-right direction. It is provided so that it can be included in one imaginary plane parallel to the center, and one central pressure contact surface is provided so as to face and parallel to one imaginary plane across the shaft. And the shaft is hold | maintained at the valve body by being press-contacted by three press-contact surfaces and being pinched | interposed.

  In addition, on the left side of the left pressure contact surface and on the right side of the right pressure contact surface, a bearing portion is provided integrally with the valve body and rotates together with the valve body, and the bearing portion is provided in a cylindrical shape to remove the shaft. Surrounding from the radial side. When the direction perpendicular to the three pressure contact surfaces is defined as the vertical direction, the right end corresponding to the left side is positioned between the left end and the right end of the left pressure contact surface. The left end corresponding to the right side is positioned between the left end and the right end of the right pressure contact surface.

  Further, on the left side of the left pressure contact surface and on the right side of the right pressure contact surface, there are formed escape spaces for preventing the shaft from contacting parts other than the three pressure contact surfaces. The dimension of the relief space in the vertical direction is set based on the amount of deflection of the shaft and valve body in the vertical direction due to press-fitting and the amount of linear expansion in the vertical direction of the shaft and valve body.

[Configuration of Example]
A configuration of the valve device 1 of the embodiment will be described based on the drawings.
As shown in FIG. 1, the valve device 1 is incorporated into a downstream end of an intake manifold 2 that is fastened to an internal combustion engine (not shown) and guides intake air for each cylinder. That is, the valve device 1 includes a valve body 4 that opens and closes an intake port 3 that is a downstream end of the intake manifold 2, a shaft 5 that transmits rotational torque to the valve body 4 to rotate the valve body 4, and the valve body 4. And a bearing body 6 that forms a part of the intake port 3 and is used to generate a tumble flow of intake air in a combustion chamber (not shown) of an internal combustion engine, for example.

As shown in FIG. 2, the valve body 4 includes a shaft holding portion 7 that is provided in parallel to the rotation axis and holds the shaft 5, a valve portion 8 that spreads in a butterfly shape with the shaft holding portion 7 interposed therebetween, and a bearing body 6 and the bearing portion 10 fitted in the bearing hole 9 (see FIG. 1B). For example, a metal member 11 mainly incorporated in the valve portion 8 is inserted into the mold and molded by resin. Is. The metal member 11 is inserted for the purpose of reinforcing the valve portion 8 and ensuring the function of generating a tumble flow when the resin portion is damaged.
Here, the shaft holding portion 7 is a portion that holds the shaft 5 in pressure contact with the shaft 5 from the outer diameter side by press-fitting the shaft 5.

  Further, the valve portion 8 is provided with a straight portion 14 on the outer peripheral edge of a portion extending to one side of the shaft holding portion 7, and the straight portion 14 is provided so as to be parallel to the rotation axis. When the intake port 3 is fully closed, a gap 15 is formed between the linear portion 14 and the inner peripheral edge of the bearing body 6 (see FIG. 1A), and the intake air is guided to the combustion chamber via the gap 15. As a result, a tumble flow is generated in the combustion chamber. It should be noted that the outer peripheral edge of the valve portion 8 that extends to the other side of the shaft holding portion 7 does not form a significant gap between the inner peripheral edge of the bearing body 6 and the intake air flow when fully closed. .

The bearing portion 10 is provided in a cylindrical shape coaxially with the shaft holding portion 7 on both ends of the shaft holding portion 7 and surrounds the shaft 5 from the outer diameter side.
The shaft 5 is provided, for example, as a prismatic bar whose section perpendicular to the axial direction of the shaft 5 is a rectangle or a square, and rotates with a rotational torque applied from a predetermined actuator (not shown). The shaft 5 is press-fitted into the same number of valve bodies 4 as the number of cylinders of the internal combustion engine, and rotates all the valve bodies 4 in synchronization.

[Features of Examples]
A configuration of the valve device 1 of the embodiment will be described based on the drawings.
As shown in FIG. 2, the shaft holding portion 7 has three planar pressure contact surfaces 17 </ b> L, 17 </ b> C, and 17 </ b> R that come into pressure contact with the shaft 5 by press-fitting the shaft 5. The three pressure contact surfaces 17L, 17C, and 17R are arranged in the order of left, center, and right from the left side to the right side when the direction of the rotation axis (the axial direction of the shaft 5) is defined as the left-right direction. Is provided.

  The two left and right pressure contact surfaces 17L and 17R are provided so that both surfaces can be included in an imaginary plane 18 parallel to the left and right direction, and one central pressure contact surface 17C sandwiches the shaft 5 therebetween. It is provided so as to face and parallel to the imaginary plane 18. For this reason, the shaft 5 press-fitted along the direction of the rotational axis is held by the valve body 4 by being pressed and sandwiched between the three press contact surfaces 17L, 17C, and 17R.

  The bearing portion 10 is provided on the left side of the left pressure contact surface 17L and the right side of the right pressure contact surface 17R (hereinafter, the left bearing portion 10 is referred to as the left bearing portion 10L, and the right bearing portion 10 is referred to as the left bearing portion 10L). Called right bearing portion 10R). Here, the direction perpendicular to the three pressure contact surfaces 17L, 17C, and 17R is defined as the vertical direction, and when the vertical direction is determined as shown in FIG. 2, the central pressure contact surface 17C is pressed against the shaft 5 from the upper side, The surfaces 17L and 17R are in pressure contact with the shaft 5 from below.

  In addition, in the left-right direction, the right end of the upper portion of the left bearing portion 10L (hereinafter referred to as the left-side corresponding right end 20) is positioned so as to substantially coincide with the left end 17La of the left pressure contact surface 17L. The left end of the upper portion of the right bearing portion 10R (hereinafter referred to as the right corresponding left end 21) is positioned so as to substantially coincide with the right end 17Rb of the right pressure contact surface 17R.

  That is, a through hole 23 through which the shaft 5 passes is provided in a series of shaft portions 22 that are connected to the left bearing portion 10L, the shaft holding portion 7 and the right bearing portion 10R, and the through hole 23 is formed at the left end of the shaft portion 22 ( The left end of the left bearing part 10L and the right end of the shaft part 22 (the right end of the right side bearing part 10R) are opened to the left and right, respectively. The through hole 23 opens downward at the lower center of the shaft portion 22 (hereinafter, the lower center opening portion is referred to as a central lower opening portion 24). The openings 24 are opened upward on both the left and right sides of the opening 24 (hereinafter, the upper left and right openings are referred to as an upper left opening 25 and an upper right opening 26, respectively).

  The left end of the upper left opening 25, the left end corresponding to the left end 20, and the left end 17 La of the left pressure contact surface 17 </ b> L coincide with each other in the left-right direction, and on the left side of the left end 17 La, 10Ln is inclined in a tapered shape toward the lower left. Similarly, regarding the position in the left-right direction, the right end of the upper right opening 26, the left end 21 corresponding to the right side, and the right end 17Rb of the right pressure contact surface 17R coincide with each other, and on the right side of the right end 17Rb, The wall surface 10Rn is tapered toward the lower right.

With such a configuration of the valve body 4, in the resin molding of the valve body 4, the mold release direction after molding can be made only up and down and left and right.
That is, as shown in FIG. 3, the left and right press contact surfaces 17L and 17R can be provided by pulling the upper die 29p upward, and the central press contact surface 17C can be provided by pulling the lower die 29n downward. . Further, the left mold and the right mold 29a, 29b are pulled out to the left and right, respectively, so that the upper side of the left bearing part 10L, the lower inner wall surface 10Lp, 10Ln, the upper side of the right bearing part 10R, and the lower inner wall surface. 10Rp and 10Rn can be provided.

  Here, in order to achieve cost reduction, for example, when considering reducing accuracy in forming the press contact surfaces 17L, 17C, and 17R, the size tolerance of the press fitting allowance to be applied to the press contact surfaces 17L, 17C, and 17R is increased. It is possible to do. Incidentally, the correlation between the press-fit allowance and the shift load is a linear correlation in which the shift load increases as the press-fit allowance increases, as shown in FIG.

  The displacement load is, for example, that a load is applied to one or both of the valve body 4 and the shaft 5 that are fixed and relatively stationary by press-fitting in the same direction or in the opposite direction to the press-fitting load. And a load necessary to slide one of the shafts 5 relative to the other and move it relatively. Further, the deviation load can be expressed as a mathematical expression, for example, by multiplying the press-fit load by a coefficient, and this coefficient is smaller than 1 and larger than 0. For this reason, the displacement load is numerically smaller than the press-fit load.

  The increase rate of the displacement load with respect to the press-fitting allowance is the distance L1 between the center press contact surface 17C and the left press contact surface 17L (see FIG. 2B), or the center press contact surface 17C and the right press contact. The larger the distance L2 in the left-right direction with respect to the surface 17R (see FIG. 2B), the smaller. Therefore, as the distances L1 and L2 increase, the rate of increase of the shift load with respect to the press-fit allowance becomes smaller, and the gradient of the correlation between the press-fit allowance and the shift load becomes gentle, and as a result, the allowable range of the shift load is achieved. It is possible to shift the numerical range of the press-fitting allowance necessary for this to the large side, and to widen the dimensional tolerance of the press-fit allowance.

  However, priority is given to an increase in the distances L1 and L2, the right end 17Lb of the left pressure contact surface 17L is positioned on the left side of the left corresponding right end 20 (see FIG. 5B), or the left end of the right pressure contact surface 17R. If 17Ra is positioned on the right side of the left end 21 corresponding to the right side, the restriction that the die cutting direction is only up and down and left and right cannot be satisfied.

  That is, when the right end 17Lb is positioned on the left side of the left-side corresponding right end 20, the portion 30 between the left-side corresponding right end 20 and the right end 17Lb in the left-right direction in the upper side of the left-side bearing portion 10L becomes an obstacle, and the portion 30 is It becomes impossible to provide the upper mold 29p by removing the upper part. Similarly, even if the left end 17Ra of the right pressure contact surface 17R is positioned on the right side of the left end 21 corresponding to the right side, a portion that cannot be provided due to the upper punching of the upper die 29p occurs.

Therefore, the right end 17Lb is moved as close as possible to the left corresponding right end 20 (see FIG. 5A), and the left end 17Ra is moved as close as possible to the right corresponding left end 21 so that the distances L1 and L2 are maximized. . At the same time, the left end 17La of the left pressure contact surface 17L is matched with the left corresponding right end 20, and the right end 17Rb of the right pressure contact surface 17R is matched with the right corresponding left end 21.
As described above, it is possible to satisfy the restriction that the die cutting direction is only up and down and left and right, and it is possible to widen the dimensional tolerance of the press-fitting allowance and achieve cost reduction.

  By moving the left end 17La of the left pressure contact surface 17L to the left and enlarging the left pressure contact surface 17L to the left side, the left corresponding right end 20 is positioned on the right side of the left end 17La and on the left side of the right end 17Lb. You may make it take (refer FIG.5 (c)). Similarly, by moving the right end 17Rb of the right press contact surface 17R to the right and enlarging the right press contact surface 17R to the right side, the right corresponding left end 21 is set to the right side of the right left end 17Ra and to the right end 17Rb. It may be positioned on the left side.

  Further, the right end 17Lb of the left pressure contact surface 17L may be moved to the left so as to coincide with the left corresponding right end 20, and similarly, the left end 17Ra of the right pressure contact surface 17R is moved to the right to correspond to the right corresponding left end 21. May be matched.

  Further, in the through hole 23, a portion that penetrates the left bearing portion 10L, that is, a left portion of the left pressure contact surface 17L and a portion that penetrates the right bearing portion 10R, the right side of the right pressure contact surface 17R. This part functions as a relief space 31 that prevents the shaft 5 from coming into contact with parts other than the three pressure contact surfaces 17L, 17C, 17R.

That is, the shaft 5 is pressed downward by the central press contact surface 17C and is pressed upward by the left and right press contact surfaces 17L and 17R. For this reason, the shaft 5 bends downward in a V shape so that the portion pressed by the central pressure contact surface 17C protrudes downward (see FIG. 2C). Further, the shaft holding portion 7 is pressed upward by a pressing reaction force by the central press contact surface 17C and pressed downward by a pressing reaction force by the left and right press contact surfaces 17L and 17R. For this reason, the shaft holding portion 7 bends upward in a V shape so that the portion forming the central pressure contact surface 17C protrudes upward (see FIG. 2C).
Furthermore, the shaft 5 and the shaft holding portion 7 linearly expand in the vertical direction according to the temperature and the like.

As a result, for example, the shaft 5 may abut on the left end of the upper inner wall surface 10Lp of the left bearing portion 10L, or the shaft 5 may abut on the right end of the upper inner wall surface 10Rp of the right bearing portion 10R.
Therefore, the vertical dimension of the relief space 31 is set based on the amount of vertical deflection of the shaft 5 and the shaft holding portion 7 due to press-fitting and the amount of linear expansion of the shaft 5 and the shaft holding portion 7 in the vertical direction.

  That is, the maximum value assumed for the vertical deflection amount of the shaft 5 and the shaft holding portion 7 due to press-fitting and the maximum value assumed for the linear expansion amount of the shaft 5 and the shaft holding portion 7 in the vertical direction are taken into consideration. The maximum amount of vertical deflection of the shaft 5 and the shaft holding portion 7 due to press-fitting is assumed, and the maximum amount of linear expansion in the vertical direction of the shaft 5 and the shaft holding portion 7 is assumed. Even if it exists, the dimension regarding the up-down direction of the escape space 31 is set so that the shaft 5 may not contact parts other than the three press contact surfaces 17L, 17C, and 17R.

[Effects of Examples]
According to the valve device 1 of the embodiment, the valve body 4 has three planar pressure contact surfaces 17L, 17C, and 17R that are pressed against the shaft 5 by press-fitting the shaft 5, and has three pressure contact surfaces 17L, 17C, and 17R. Are arranged in the order of left, center, and right. Further, the two left and right pressure contact surfaces 17L and 17R are provided so that both of the entire surfaces can be included in an imaginary plane 18 parallel to the left and right direction, and one central pressure contact surface 17C sandwiches the shaft 5 therebetween. It is provided so as to face and parallel to the imaginary plane 18.

And the shaft 5 is hold | maintained at the valve body 4 by being pressed and pinched by three pressure-contact surface 17L, 17C, 17R.
As a result, the shaft 5 is brought into pressure contact only with the three pressure contact surfaces 17L, 17C, and 17R and is held by the valve body 4, so that the displacement load can be reduced. In addition, since the entire area of the pressure contact surfaces 17L, 17C, and 17R is small, reduction of the shift load due to stress relaxation is reduced, and the shift load can be stabilized.

Further, regarding the position in the left-right direction, the left corresponding right end 20 coincides with the left end 17La of the left pressure contact surface 17L, and the right corresponding left end 21 coincides with the right end 17Rb of the right pressure contact surface 17R.
Thereby, the restriction | limiting which makes the die-cut direction after resin molding of the valve body 4 only up and down and right and left can be satisfy | filled. Further, the distance L1 is increased by moving the right end 17Lb of the left pressure contact surface 17L as close as possible to the left corresponding right end 20, and the distance L2 is set as close as possible to the left end 17Ra of the right pressure contact surface 17R as close to the right corresponding left end 21. By increasing the size, the slope of the correlation between the press-fitting allowance and the shift load can be relaxed, the dimensional tolerance of the press-fitting allowance can be widened, and the cost can be reduced.

  Further, on the left side of the left pressure contact surface 17L and the right side of the right pressure contact surface 17R, an escape space 31 is formed to prevent the shaft 5 from contacting the portions other than the three pressure contact surfaces 17L, 17C, 17R, respectively. ing. The dimension of the relief space 31 in the vertical direction is set based on the amount of vertical deflection of the shaft 5 and the shaft holding portion 7 due to press-fitting and the amount of linear expansion in the vertical direction of the shaft 5 and the shaft holding portion 7. Yes.

  Thereby, the dimension of the escape space 31 in the vertical direction can be set in consideration of the variation factor in the vertical direction of the dimensions of the shaft 5 and the shaft holding portion 7. For this reason, it is possible to avoid a situation in which the shaft 5 and the valve body 4 are in contact with each other except the three pressure contact surfaces 17L, 17C, and 17R and the displacement load increases.

[Reference example]
According to the valve device 1 of the real施例, but restricted to limit the demolding direction after resin molding vertically and horizontally it was attached, indicating With no such limitation, for example, FIG. 5 (b) As in the reference example, the right end 17Lb of the left pressure contact surface 17L is moved to the left side of the left side corresponding right end 20 to increase the distance L1, or the left end 17Ra of the right pressure contact surface 17R is set to the right side of the right side corresponding left end 21. The distance L2 is further increased to increase the dimensional tolerance of the press-fitting allowance by further relaxing the gradient of the correlation between the press-fit allowance and the shift load.

[Modification]
The aspect of the valve device 1 is not limited to the embodiment, and various modifications can be considered.
According to the valve device 1 of the real施例, the valve body 4 is a metal member 11 and inserted into a mold was to be molded, for example, the metal member 11 in After molding the resin only partially Further, the valve body 4 may be provided only by a resin material without using the metal member 11 as an insert.

1 Valve device 3 Intake port (flow path)
4 Valve body 5 Shaft 10 Bearing portion 10L Left bearing portion (left bearing portion)
10R Right side bearing (right side bearing)
17L Left pressure contact surface 17C Center pressure contact surface 17R Right pressure contact surface 17La Left pressure contact surface left end 17Lb Left pressure contact surface right end 17Ra Right pressure contact surface left end 17Rb Right pressure contact surface right end 18 Fictional plane 1 plane)
20 left corresponding right end (of the bearing portion of the left, the right end portion on the opposite side of the position and the left contact face in the vertical direction)
21 Left end corresponding to the right side (Left end of the portion on the opposite side of the right pressure contact surface in the up-down direction of the right bearing)
31 escape space

Claims (2)

A valve body that opens and closes a flow path through which intake air sucked into the internal combustion engine is passed;
In the valve device comprising a shaft that is press-fitted into the valve body and transmits the rotational torque to the valve body to rotate the valve body,
The valve body has three planar pressure contact surfaces that are pressed against the shaft by press-fitting the shaft;
These three pressure contact surfaces are provided so as to be arranged in the order of left, center, and right when the axial direction of the shaft is defined as the left-right direction,
The two left and right pressure contact surfaces are provided so that both surfaces can be included in one imaginary plane parallel to the left-right direction,
One central pressure contact surface is provided so as to face and parallel to the one imaginary plane across the shaft,
The shaft is held by the valve body by being pressed and sandwiched between the three pressure contact surfaces ,
On the left side of the left pressure contact surface and the right side of the right pressure contact surface, respectively, bearings are provided integrally with the valve body and rotate together with the valve body,
The bearing portion is provided in a cylindrical shape and surrounds the shaft from the outer diameter side,
When a direction perpendicular to the three pressure contact surfaces is defined as a vertical direction,
Of the left bearing part, the right end of the portion located on the opposite side of the left pressure contact surface with respect to the vertical direction is positioned between the left end and the right end of the left pressure contact surface,
The left end of the portion of the right bearing portion that is located on the opposite side of the right pressure contact surface with respect to the vertical direction is positioned between the left end and the right end of the right pressure contact surface. Valve device to do. The valve device according to claim 1,
On the left side of the left pressure contact surface and on the right side of the right pressure contact surface, there are formed escape spaces that prevent the shaft from contacting parts other than the three pressure contact surfaces,
When the direction perpendicular to the three pressure contact surfaces is defined as the vertical direction, the dimension of the relief space with respect to the vertical direction is the amount of deflection of the shaft and the valve body in the vertical direction due to press-fitting, and the shaft and the valve. A valve device that is set based on a linear expansion amount of the body in the vertical direction .

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